I want to implement an express paypal checkout for my website. People basically choose an item and buy it. There is no recurring payments or so. Do I have to save buyer's card info in addition to transaction and order id ? If yes what should I store in my database ? I basically don't want to deal with credit cards security and stuff on my side in case my db got hijacked.
saving buyer's card info after paypal express checkout
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By using express checkout the customer won't be entering any card details into your site. That is all handled at PayPal.
PayPal has great documentation with flows.
https://www.x.com/developers/paypal/documentation-tools/express-checkout/integration-guide/ECGettingStarted